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Registered Member
You should not have to mod the tunnel for a 4l60 they are the same as a 700r case and thousands reside in trifives.
I Also might add you guys running these OD trans behind even a stock LS1 be careful with a stock 3.5 drive shaft. I twisted a brand new one off at 135 mph about a foot behind the trans. I'm lucky to be here. In my case my front angle on the trans was a bit much which probably contributed to the failure I raised the tail an inch. I went back with a 4 inch and thicker wall basically nascar truck specs drive shaft. There have been many failures on the dyno with ls swaps in these older cars. Especially when they start making big horse power. The dyno has to run the car up to top of 3rd gear. I was just below the top of 3rd pulling strong when mine let go....
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bihili, in addition to Cnut's comments, you probably should pick a bigger flat area to use for your measurement. Also, I've seen the output shaft droop a bit when the yoke is removed, especially on automatics. Not sure the best spot on an LS/4L60 but there has to be a better one.
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Registered Member
The oil pan flange or trans flange are good areas even the bottom of the trans pan is flat good place for angle indicater.
For height reference I set my LS holley pan on a 2x4 so it is 1.5 inches higher than the center dropped area on the crossmember. I built my engine mounts with engine setting on the board. Hope that helps.
S&P oil pan.
Pan being installed.
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Registered Member
Found the problem.
The engine angle at the tail shaft was giving me a false reading.
I put the angle finder on the bottom of the head and got a correct reading.
Now the engine is installed at 3 degrees and transmission clears the tunnel.
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Registered Member
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Glad to hear that worked out.
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